Start a browser and point to http:// ip_address_of_server/nps/iManager.html.
For example, http://192.168.1.1/nps/iManager.html.
Accept the certificate, enter the Administrator account/password and eDirectory tree, and click Login.
Under Roles and Tasks, select Rights > Modify Trustees.
Select the Container object and click OK.
Click Add Trustee.
Select a User from any Container.
Click Assigned Rights for added trustee user.
Select Compare and Read rights for All Attribute Rights entry.
By performing the above mentioned steps, a Domain user gets the rights to read all the attributes of users and groups under particular container, and can be used as LDAP sync proxy user in Filr.